Hi, reading your post years later lol.   
      
   I have cracked a block by pouring cold water into a non running engine while   
   it was hot (not just normal operating temperature)   
      
   I had refilled this engine hot multiple times before, while running, no   
   problem..... This time I shut it off, waited for the pressure to go down to   
   where I could remove the cap sort of safely, then pored water in,   
   - this time without starting.   
      
   I poured about half a gallon in, and I heard a loud pop. The engine block was   
   cracked and the coolant ran into the cylinder. 3/10 would not do again.   
      
   I think the danger is higher with a cast iron block, but I'm not sure.   
      
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